Trucks battery won't stay charged over night..

Asked by Jan 22, 2016 at 09:19 PM about the 1999 Dodge Ram 1500 4 Dr Laramie SLT 4WD Extended Cab SB

Question type: Maintenance & Repair

My 99 Dodge Ram 1500 5.9 V8 4x4 won't stay
charged when left for more than at least 12 hours
over night. Had AAA mechanic come out and put 2
new batteries in it and test; starter, battery,
alternator which all is good. He checked a couple of
things like all fuses in box and my stereo to see if
power was being pulled but nothing.. I've tried
driving it after new battery was put into it and it
starts and runs. When I turn it off you can hear a
buzzing or humming sound coming from around the
engine compartment but can't seem to find where
noise is coming from.. When I did drive it to work I
noticed that and when I got off the battery was
completely dead it wouldn't even jump start.
Mechanic said could be a short in the wiring
somewhere but that could be anywhere and take a
shop time and a lot of money to find and fix..Can
anyone help if any ideas what exactly it could be if it
could be a simple fix, please???

1 Answer

113,905

Before you can do any testing the battery needs to be fully recharged, so disconnect 1 battery cable and recharge the battery, next make sure everything is turned off, then just reconnect for a few seconds, then disconnect a cable and put a test light in between the battery post and cable terminal end, if the light turns on then you have a major battery draw, so the first thing to electrically disconnect is the alternator, if the light goes out then you have found your problem, if not then start removing the fuses one at a time, noting where each fuse goes, keep removing fuses until the light goes out, then find out what is on that fuse and trace down the problem componet or wiring and repair or replace, then start putting the fuses back in one at a time just make sure you didn't miss anything and finally reconnect the alternator, if the light stays off then your battery drain is fixed. Note: on some vehicles. They have a parasitic draw this will make the test light glow very dim that light is normal as long as it is just a glow. HTH

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